Question about 2004 Chevrolet TrailBlazer

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Need to change coolent temperture sensor.How do i locate it?

My car came up with code po128

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The sensor should be located on the thermostat housing...follow the upper rad hose to the engine, where it enters the engine is the thermo housing...should have an oval plug with 2 wires

Posted on Feb 20, 2009

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What is the cause for this po128 dtc code on a 2005 chrysler sebring ?


Po128 is the code for coolant temperature too low, or a faulty temperature sensor. Your vehicle needs the coolant at a certain temperature to cool your engine efficiently. I also suggest looking at your coolants protection level with either a hydrometer or refractometer. You can change both the sensor and thermostat fairly inexpensively...yourself. Of course a shop will make a big deal out of it I'm sure. Make sure to clear the code with the scanner after the repair is complete.

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Does the code po128 have any thing to do with the auto trany shifting hard at times had the trany fluid and filter replaced today has not shifted hard today yet anyway .paved $2200. because check eng


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Trouble codes for 2003 Chevy Blazer


Code 155 is for a problem with the heater circuit in the O2 sensor for bank two. Bank two is on the side with cylinder number two.
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Need to locate coolant temperature sensor 2006 milan 2.3


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I changed the thermostat and it's still reading hot coolent temperture


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1 Answer

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1 Answer

What do I need to do to fix my 2005 trailblazer. its reading a code po128


Change the coolant temperature sensor. If the code is still there, change the thermostat, it might be stuck open causing the engine to run cooler than it should.

Aug 29, 2009 | 2005 Chevrolet TrailBlazer

2 Answers

1996 Jetta appears to overheat but no coolent loss


the temp sensor is the trigger for the fans!!
the thermostat may be in upside down??
check new thermostat in a pot of water & heat it up watch that it opens up when it heats up should be at aroun 96 degrees F
otherwise the radiator may need a good clean out or a recore!
there my be a blocked water gallery so engine may need a flush aswell
Cheers Rob

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1 Answer

Po128 code on 2001 corvette


replace the thermostat. computer sees engine is running too cool thermostat stuck open.

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